Statistics for occurrence #1 of “Commander Walke” in chapter 24 of Admiral David D. Porter, The Naval History of the Civil War.:

... ( tin-clads ) to clear the Yazoo River of torpedoes and cover the landing of Sherman's Army when it should arrive. This arduous and perilous service was well performed. On the 11th of December, Commander Walke dispatched the two tin-clads on a reconnoisance up the Yazoo. They ascended some twenty miles, when they were apprized of the presence of torpedoes by a great number of small boats along the chann...
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